Fast Five Quiz: Plaque Psoriasis

William James, MD


June 09, 2021

Figure 1. Illustration, common sites of plaque psoriasis.

Although psoriasis can affect virtually any ethnic group, epidemiologic studies have shown a higher prevalence in western European and Scandinavian populations, where 1.5%-3% of persons are affected by the disease. Arctic Kasach'ye has the highest documented disease prevalence, with 12% of the population affected, followed by Norway, where 4.8% of the population are affected by psoriasis.

Genetic factors are believed to play a role in the pathophysiology of psoriasis. For example, human leukocyte antigen (HLA)-B13, HLA-B17, and HLA-Cw6 are all associated with plaque psoriasis, and family history has been identified as a predictor of disease occurrence.

Psoriasis affects adult men and women equally, but women tend to have an earlier age of onset.

Several peak age ranges for the onset of plaque psoriasis have been identified, including one in persons aged 57-60 years.

Learn more about the epidemiology of plaque psoriasis.


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